Shu-up

exp.

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A rude way of asking someone to desist from talking. Also Shurrup.

In use

Mary: "So when are ye back tew work girl?" Joan: "Shu-up, ye cow!"

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Greetings, dear reader. Would you like me to translate 'Shu-up' in use for you?

'So when are you back to work, dear?' 'Oh, hush, you cow!'